不同钾肥用量对甜瓜幼苗生长及基质特性的影响
Effects of Different Potassium Fertilizer Levels on Growth of Melon Seedlings and Substrate Characteristics
李蒙 1熊婷婷 1朱思远 1袁童瑶 1张健 1龚守富1
作者信息
- 1. 信阳农林学院园艺学院,信阳市大别山区园艺植物遗传改良重点实验室,信阳,464000
- 折叠
摘要
为探明钾肥用量对甜瓜幼苗生长及基质特性的影响,本研究采用穴盘育苗方式,测定了施用不同浓度钾肥的基质中微生物含量、碱解氮等基质理化性质以及甜瓜幼苗的茎粗、叶面积等形态指标和叶绿素含量等生理指标.结果表明,施用适量的钾肥能改善基质的容重和孔隙度,显著提高基质的EC值及基质中微生物含量;随着钾肥浓度的增大,育苗基质中碱解氮、速效磷含量呈现先减少后增加的趋势,而育苗基质中速效钾含量呈现递增趋势;添加一定量的钾肥可以显著促进甜瓜幼苗的生长,其中T2处理下,甜瓜幼苗的茎粗、叶面积等形态指标显著优于其他处理,叶片叶绿素含量及甜瓜幼苗植株氮、钾、钙、镁等营养元素含量最高.综上所述,施用适量钾肥可以改善基质的理化性质,促进甜瓜幼苗生长和植株营养元素的积累,并以T2处理(钾肥浓度为0.70 g/L)时效果最佳.本研究为甜瓜生长发育期合理施肥、培育优质壮苗提供了理论依据.
Abstract
In order to explore the effect of potassium fertilizer application rate on the growth and substrate char-acteristics of melon seedlings,this study used a plug seedling method to determine the physical and chemical prop-erties of the substrate such as microbial content and alkali-hydrolyzed nitrogen in the substrate with different con-centrations of potassium fertilizer,and the stem diameter,leaf area and other morphological indicators and physio-logical indicators such as chlorophyll content of melon seedlings.The results showed that proper amount of potas-sium fertilizer could improve the bulk density and porosity of substrate,and significantly increase the EC value and microbial content of substrate.With the increase of potassium fertilizer concentration,the contents of alka-li-hydrolyzable nitrogen and available phosphorus in seedling matrix decreased first and then increased,while the content of available potassium in seedling matrix increased;adding a certain amount of potassium fertilizer can significantly promote the growth of melon seedlings,under T2 treatment,the morphological indexes such as stem diameter and leaf area of melon seedlings were significantly better than other treatments,the chlorophyll content of leaves and the contents of nitrogen,potassium,calcium and magnesium in melon seedlings were the highest.In summary,the application of appropriate amount of potassium fertilizer can improve the physical and chemical properties of the substrate,promote the growth of melon seedlings and plant nutrient accumulation,and T2 treat-ment(potassium concentration of 0.70 g/L)is the best.This study provides a theoretical basis for rational fertiliza-tion and cultivation of high-quality and strong seedlings of melon during the growth and development period.
关键词
钾肥用量/甜瓜幼苗/生长/营养元素Key words
Potassium fertilizer application rate/Melon seedlings/Growth/Nutrient element引用本文复制引用
出版年
2024
NETL
NSTL
万方数据